Three-pole apparatus for a medium or high voltage cubicle and associated cubicle comprising such a three-pole apparatus

Abstract

A three-pole apparatus, configured to be installed in a cubicle of an electric substation, comprises an air-insulated three-pole disconnector and a three-pole circuit breaker. The air-insulated three-pole disconnector is configured to isolate an electric line leaving the cubicle. The three-pole circuit breaker is configured to perform line protection functions. The three-pole apparatus comprises a casing comprised of insulating material and internally housing, at least partially, the three-pole circuit breaker. The casing is not sealingly closed and contains air. The circuit breaker comprises three vacuum circuit-breaker modules; the disconnector comprises three single-pole disconnector devices. Each of the single-pole disconnector devices in turn comprises a contact movable linearly from a service position into a disconnection position. Each of the contacts, when it is in its service position, projects at least partially from the casing. The three-pole apparatus is configured for cooperating with an earthing switch which is not enclosed into the casing.

1. A three-pole apparatus to be installed in a cubicle of an electric substation, comprising:
 an air-insulated three-pole disconnector configured for performing functions of isolating an electric line leaving the cubicle, 
 a three-pole circuit breaker configured for performing line protection functions, 
 a casing comprised of insulating material and at least partially internally housing said three-pole circuit breaker, wherein said casing is not sealingly closed and contains air; 
 wherein the three-pole circuit breaker comprises three vacuum circuit-breaker modules and the three-pole disconnector comprises three single-pole disconnector devices, wherein each of the single-pole disconnector devices in turn comprises a contact movable linearly from a service position into a disconnection position; 
 wherein each of the contacts, when it is in its service position, projects at least partially from the casing; and 
 wherein the three-pole apparatus is configured for cooperating with an earthing switch which is not enclosed into said casing. 
 
   
   
     2. The apparatus according to  claim 1 , wherein
 the apparatus further comprises a shaft for actuating the isolating devices, wherein the isolating device actuating shaft is supported, directly or indirectly, by the casing; and 
 the apparatus also comprises a shaft for actuating the vacuum circuit-breaker modules, wherein the vacuum circuit-breaker module actuating shaft is supported, directly or indirectly, by the casing. 
 
   
   
     3. The apparatus according to  claim 2 , wherein the vacuum circuit-breaker module actuating shaft is arranged outside from said casing. 
   
   
     4. The apparatus according to  claim 1 , wherein the axis of each of said movable contacts of single-pole disconnector device coincides with the axis of a respective vacuum circuit-breaker module. 
   
   
     5. The apparatus according to  claim 1 , wherein the axis of each of said movable contacts of single-pole disconnector device is substantially vertical. 
   
   
     6. The apparatus according to  claim 1 , wherein said three-pole disconnector comprises three guide tubes, each guide tube being configured to guide a respective contact of the three movable contacts. 
   
   
     7. The apparatus according to  claim 4 , wherein each guide tube has at least one guiding groove formed therein for guiding a pin passing through a respective movable contact, the movement of said pin being controlled by a link rod/crank assembly operated by said shaft actuating the single-pole isolating devices. 
   
   
     8. The apparatus according to  claim 1 , further comprising a system of levers, actuated by said shaft for actuating the vacuum circuit breaker modules, which operates movable contacts of the vacuum circuit-breaker module. 
   
   
     9. A cubicle of a medium or high voltage electric substation comprising:
 at least one three-pole apparatus; 
 support guides configured to introduce, extract, or hold in position at least one three-pole apparatus,
 wherein the three-pole apparatus comprises:
 an air-insulated three-pole disconnector which is configured for performing functions of isolating the electric line leaving the cubicle; 
 a three-pole circuit breaker which is configured for performing line protection functions; 
 a casing comprising insulating material and which at least partially internally houses said three-pole circuit breaker; 
 
 wherein the three-pole circuit breaker comprises three vacuum circuit-breaker modules and wherein the three-pole disconnector comprises three single-pole disconnector devices, each of the single-pole disconnector devices in turn comprising a contact movable linearly from a service position into a disconnection position; 
 wherein each of the contacts, when it is in its service position, projects at least partially from the casing; and 
 wherein the three-pole apparatus is configured for cooperating with an earthing switch which is not enclosed into said casing, 
 wherein the cubicle also comprises a partition between voltage busbars and the three-pole apparatus, the partition having an opening through which the movable contacts of the three-pole disconnector can pass. 
 
 
   
   
     10. The cubicle according to  claim 9 , further comprising a separating shutter movable between a first open position where it allows the movable contacts of the three-pole disconnector to pass through and a second position where it closes the opening. 
   
   
     11. The cubicle according to  claim 10 , wherein movement of said separating shutter is dependent upon the position of the movable contacts of the three-pole disconnector. 
   
   
     12. The cubicle according to  claim 9 , wherein movement of said separating shutter is dependent on the presence or absence of a panel for closing said cubicle. 
   
   
     13. The cubicle according to  claim 9 , further comprising an earthing switch with an arm rotatable from a service position into an earthing position. 
   
   
     14. The cubicle according to  claim 9 , further comprising a shaped plate electrically insulated from the cubicle, said shaped plate being connected to user line cables and to clamping terminals electrically connected to the three-pole apparatus.